WO2011110018A1

WO2011110018A1 - Optical power adjustment method and optical line terminal for ethernet passive optical network system

Info

Publication number: WO2011110018A1
Application number: PCT/CN2010/077075
Authority: WO
Inventors: 夏顺东
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-03-12
Filing date: 2010-09-17
Publication date: 2011-09-15
Also published as: CN102196322B; US20130004161A1; US9008505B2; CN102196322A

Abstract

An optical power adjustment method and an Optical Line Terminal (OLT) for an Ethernet Passive Optical Network (EPON) system are provided by the present invention. Wherein, said method comprises: after an OLT successfully registers at an Optical Network Unit (ONU) or an Optical Network Terminal (ONT), it starts up an optical power adjustment procedure and receives uplink data from the ONU or the ONT (201); during the optical power adjustment procedure, the OLT detects whether there are error codes in the uplink data from the ONU or the ONT; if there are no error codes, it notifies the ONU or the ONT to reduce the transmission optical power gradually, and during the gradual reduction procedure, the OLT keeps on detecting whether there are error codes in the uplink data (203); if the OLT detects that there are error codes in the uplink data during the gradual reduction procedure, it notifies the ONU or the ONT to raise the transmission optical power gradually, and during the gradual raise procedure, the OLT keeps on detecting whether there are error codes in the uplink data (205); if the OLT detects that there are no error codes in the uplink data during the gradual raise procedure, the OLT stops the adjustment (207). With the present invention, unnecessary optical power consumption in uplink data transmission of an EPON system is reduced effectively, and power saving effect is achieved.

Description

The present invention relates to the field of optical networks, and in particular to an optical passive optical network (EPON) system. Power adjustment method and Optical Line Terminal (OLT) „ Background technology

EPON is a new generation of broadband passive optical integrated access technology based on the Institute of Electrical and Electronics Engineers (IEEE) 802.3-2005 Section 5 standard. The system is usually composed of optical line terminals and optical distribution networks. The distribution network (referred to as ODN) and the Optical Network Unit (ONU) / Optical Network Termination (ONT) are shown in Figure 1. The OLT provides a network side interface for the EPON system, and the ONU provides a user side interface for the EPON system. ODN consists of single-mode fiber and passive optical components such as optical splitters and optical connectors, providing optical transmission media for the physical connection between the OLT and the ONU. The ODN is usually a point-to-multipoint structure, that is, one OLT can connect multiple ONUs through the ODN. If the ONU directly provides a user port function, such as an Ethernet user port for personal computer (PC) Internet access, it is called ONT. In an ODN network, the distance between the ONU or the ONT to the OLT is different. Because of the attenuation of the optical transmission line, the large ONU or ONT can work normally with a small optical power, while the 3 giants are far away. ONU or ONT need to work with larger optical power. In the existing EPON system, in order to enable the OLT to stably receive data of all ONUs or ONTs, the optical power of the ONU or ONT optical modules is fixedly configured according to the farthest distance supported by the OLT. In this way, for an ONU or an ONT with a close distance, the transmission power that satisfies the OLT to stably receive its data is much smaller than the transmission power of the fixed configuration according to the longest distance supported by the OLT, thus causing waste of optical power. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a light adjustment method and an OLT in an Ethernet passive optical network EPON system to solve at least the above problems. According to an aspect of the present invention, an optical power adjustment method for an EPON system is provided, including: after the optical network unit ONU registers with the optical network unit ONU or the optical network terminal ONT, Dynamic optical power adjustment process; In the optical power adjustment process, it is detected whether there is an error in the uplink data from the ONU or the ONT; if there is no error, the ONU or the ONT is notified to gradually reduce the transmission optical power, and the OLT is gradually adjusted during the step-by-step process. Continuing to detect whether there is an error in the uplink data; if the OLT detects that the uplink data is erroneous, the ONU or the ONT is notified to increase the transmission optical power step by step, and the OLT continues to detect whether the uplink data has an error code during the step-by-step up-regulation process; If the OLT detects that the uplink data is not erroneous during the step-up process, the OLT stops adjusting. Further, the adjustment mode state parameter is set in the OLT, including: recovery, up, and down. Further, after the OLT completes the optical power adjustment process step after the ONU or the ONT is successfully registered, the method further includes: initializing the adjustment mode state parameter to recovery. Further, before the OLT detects whether the uplink data from the ONU or the ONT is erroneous, the method further includes: acquiring, by the OLT, the optical power query frame of the ONU or the ONT; and receiving the optical power query frame from the ONU or the ONT; Or the optical power query response frame returned by the ONT; and the current transmitted optical power of the ear and the ONU or the ONT from the optical power query response frame. Further, the optical power adjustment method further includes not receiving the slave ONU or the set time

The optical power query response frame returned by the ONT determines the current transmit optical power of the ONU or the ONT as the upper limit of the transmit optical power. Further, before acquiring the current transmit optical power of the ONU or the ONT, the method further includes: the OLT detects that the ONU or the ONT is dropped, and the OLT stops adjusting. Further, the optical power adjustment method further includes: when the ONU or the ONT is not registered and sending a registration request to the OLT, determining whether the OLT receives the response to the registration request within the set time; if not, setting the transmission of the ONU or the ONT The optical power is the upper limit of the transmitted optical power. Further, if there is no error, the step of instructing the ONU or the ONT to lower the transmit optical power step by step includes: the OLT determines that the uplink data has no error, determines that the adjustment mode state parameter is not up, and the current transmit optical power of the ONU or the ONT is not The lower limit of the transmission optical power of the ONU or the ONT; the OLT notifies the ONU or the ONT to lower the transmission optical power of the first-level transmission, and sets the adjustment mode status parameter to be lowered; the OLT determines that the uplink data has no error, and determines that the adjustment mode status parameter is not up-regulated, and The current transmitted optical power of the ONU or ONT is the lower limit of the transmitted optical power of the ONU or ONT; then the OLT stops the adjustment. Further, if the OLT detects that the uplink data is erroneous, the step of notifying the ONU or the ONT to increase the transmission optical power step by step includes: the OLT detects that the uplink data is erroneous, and determines the current transmission light of the ONU or the ONT. The power is not the upper limit of the transmit optical power of the ONU or the ONT, and the adjustment mode status parameter is not restored. The OLT notifies the ONU or the ONT to increase the transmit optical power of the first-level transmission, and sets the adjustment mode status parameter to be up; the OLT detects that the uplink data is erroneous. The OLT determines that the current transmit optical power of the ONU or the ONT is the upper limit of the transmit optical power of the ONU or the ONT; the OLT stops the adjustment; the OLT detects that the uplink data is erroneous, and determines that the current transmit optical power of the ONU or the ONT is not the transmit light of the ONU or the ONT. The upper limit of the power, and the adjustment mode state parameter is recovery; the OLT notifies the ONU or the ONT to adjust to the upper limit of the transmitted optical power. Further, if the OLT detects that there is no error in the uplink data during the step-up process, the OLT stops adjusting: the OLT detects that the uplink data has no error, and determines that the adjustment mode state parameter is an upward adjustment; then the OLT stops the adjustment. Further, the optical power adjustment method further includes the following steps: saving the transmitted optical power after the ONU or the ONT is adjusted; after the ONU or the ONT is powered on, setting the current transmitted optical power of the ONU or the ONT to the saved transmit optical power. Further, the optical power adjustment method further includes the following steps: If the transmitted optical power of the saved ONU or the ONT is not obtained after the ONU or the ONT is powered on, set the current transmit optical power of the ONU or the ONT as the transmit light. Power cap. According to another aspect of the present invention, an optical line terminal OLT is further provided, comprising: a startup module, configured to start an optical power adjustment process after the optical network unit ONU or the optical network terminal ONT is successfully registered; and a detecting module, configured to: During the optical power adjustment process, detecting whether there is an error in the uplink data from the ONU or the ONT; and detecting whether the uplink data has an error code during the step-by-step down-stepping and step-by-step up-regulation; and the down-modulating module is configured to: if the uplink data has no error code , the ONU or the ONT is notified to lower the transmission optical power step by step; the up-modulation module is configured to notify the ONU or the ONT to increase the transmission optical power step by step if the detection module detects that the uplink data has a bit error during the step-by-step down-regulation process; If the detection module detects that the uplink data is not erroneous during the step-up process, the adjustment is stopped. Further, the adjustment mode state parameter is set in the OLT, including: recovery, up, and down. Further, the OLT further includes: an optical power acquiring module, configured to acquire the current sending light of the ONU or the ONT before the detecting module detects whether the uplink data from the ONU or the ONT is erroneous Power. Further, the down-modulation module includes: a first down-modulation module, configured to: when there is no error in the uplink data, the adjustment mode state parameter is not up-regulated, and the current transmit optical power of the ONU or the ONT is not the lower limit of the transmit optical power of the ONU or the ONT, The ONU or the ONT is notified to lower the first-level transmission optical power, and the adjustment mode state parameter is set to be down-regulated; the second downward adjustment module is configured to: when the uplink data has no error, the adjustment mode state parameter is not up-regulated, and the current transmission light of the ONU or the ONT When the power is the lower limit of the transmitted optical power of the ONU or ONT, the adjustment is stopped. Further, the up-modulation module includes: a first uplink adjustment module, configured to: when the uplink data is erroneous, the current transmit optical power of the ONU or the ONT is not the upper limit of the transmit optical power of the ONU or the ONT, and the adjustment mode state parameter is not restored, the notification is The ONU or the ONT adjusts the transmission power of the first-level transmission, and sets the adjustment mode status parameter to the upper adjustment; the second upward adjustment module is used when the uplink data has an error, and the current transmission optical power of the ONU or the ONT is the transmission optical power of the ONU or the ONT. When the time limit is set, the third uplink module is used to notify the ONU or the ONT when the current transmit optical power of the ONU or the ONT is not the upper limit of the transmit optical power of the ONU or the ONT, and the adjustment mode status parameter is restored. Adjust to the upper limit of the transmitted optical power. Further, the OLT further includes: an upper limit sending module, configured to: when the ONU or the ONT is not registered, and send a registration request to the OLT, if the OLT does not receive the response of the registration request within the set time, set the ONU or The transmitted optical power of the ONT is the upper limit of the transmitted optical power.

The service traffic in the EPON system is divided into two directions: uplink and downlink. The uplink direction refers to the direction sent from the ONU or the ONT to the OLT. The downlink direction refers to the direction that the OLT sends to the ONU or the ONT. The invention realizes adaptive adjustment of the uplink optical power of the ONU or the ONT of the EPON system, and the ONU or the ONT can adjust the transmission optical power to the extent of adapting to the uplink data transmission autonomously and quickly, and on the one hand, effectively ensure the uplink direction. The quality of communication, on the other hand, effectively reduces unnecessary optical power consumption and achieves a power saving effect. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic structural diagram of an EPON system in the prior art; 2 is a flow chart of the first embodiment of the optical power adjustment method of the EPON system of the present invention; FIG. 3 is a flow chart of the second embodiment of the optical power adjustment method of the EPON system of the present invention; FIG. 5 is a flow chart of a step of a method for obtaining an optical power of an ONU or an ONT according to an embodiment of the present invention; FIG. FIG. 7 is a structural diagram of an optical power query message frame according to the present invention; and FIG. 8 is a structural diagram of an optical power query response message frame according to the present invention; Figure 9 is a block diagram showing the structure of an OLT of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. Referring to FIG. 2, a flow chart of the first embodiment of the optical power adjustment method of the EPON system of the present invention is shown. The method may include the following steps: Step 201: After the OLT successfully registers with the ONU or the ONT, the OLT starts the optical power adjustment process. Receiving the uplink data from the ONU or the ONT; Step 4: 203: The OLT detects whether the uplink data has an error. If there is no error, the ONU or the ONT is notified to lower the transmission optical power step by step, and continues to detect during the step-by-step downward adjustment process. Whether there is error code in the uplink data;

The OLT adjusts the transmission optical power step by step through the optical power adjustment message frame through the ONU or the ONT. In this embodiment, the OLT reduces the current transmit optical power step by step through an extended ONU or ONT through an extended operation, Administration, and Maintenance Protocol Data Unit (OAM PDU). The OAM PDU frame is for IEEE The OAM PDU frame format of clause 57.4.2 of the 802.3ah protocol is extended to form a new optical power adjustment OAM PDU frame. 6 is a structural diagram of an optical power adjustment OAM PDU frame, the frame length is 64 bytes, and the Code field is 05 (the value of the Code field can be flexibly set according to actual conditions), and the first byte of the Data field represents light. Power level. It should be noted that the optical power adjustment message frame may be set correspondingly according to the structure of the OAM PDU frame shown in FIG. 6 according to the configuration of the service provider, and the present invention does not need to be limited. During the step-by-step down process, the OLT continues to detect whether the uplink data has an error. Step 205: If the OLT detects that the uplink data is erroneous in the step-by-step process, the ONU or the ONT is notified to increase the transmit optical power step by step, and the OLT continues to detect whether the uplink data has an error code during the step-by-step up-regulation process; The OLT continues to detect whether the uplink data has an error code. If there is no error, the OLT continues to down-regulate the transmission optical power of the ONU or the ONT, and continues to detect the uplink data error. If an error occurs, the ONU or the ONT is notified. The transmit optical power is adjusted step by step.

The OLT informs the ONU or the ONT to increase the transmission optical power step by step through the optical power adjustment message frame. The optical power adjustment message frame may be an optical power adjustment OAM PDU frame as shown in FIG. 6. During the step-by-step up-regulation process, the OLT continues to detect whether the uplink data has an error. Step 207: If the OLT detects that the uplink data is not erroneous during the step-up process, the OLT stops adjusting. When the transmission optical power of the ONU or the ONT is adapted to the transmission optical power required for the uplink data transmission, the uplink data is not erroneous, the OLT stops the adjustment of the transmission optical power, and sets the transmission optical power to the power, ONU or ONT. The uplink data is transmitted by the transmitted optical power. Referring to FIG. 3, a flow chart of a second embodiment of an optical power adjustment method of an EPON system according to the present invention is shown. Specifically, the method includes the following steps: Step 301: The OLT terminal is configured with an adjustment mode state parameter, and initializes its value to be restored. The adjustment mode state parameters include recovery, up and down. Step 303: The OLT determines whether the ONU or the ONT has been dropped, and if so, ends the adjustment; if not, then the step 4 is 305; The OLT determines whether the ONU or the ONT is offline. If the line is dropped, the adjustment is ended. If the line is not dropped, step 305 is performed. Step 305: The OLT acquires the current transmit optical power of the ONU or the ONT.

The OLT can query the current transmit optical power of the ONU or the ONT by sending an optical power query frame. For the specific implementation, refer to the embodiment shown in FIG. 5. Step 307: The OLT detects whether there is an error in the uplink data in the set time. If no, the process goes to step 309; if yes, the process proceeds to step 415; the set time can be appropriately set by a person skilled in the art according to actual needs. Step 309: The OLT determines whether the adjustment mode status parameter is an up-regulation, and if yes, ends the adjustment; if not, the step 4 is 311; if there is no error in the uplink data, there is no need to further increase the transmission optical power of the ONU or the ONT. Then the OLT ends the adjustment; otherwise, if the adjustment mode status parameter is restored or down, the execution continues downward. Step 311: The OLT determines whether the current transmitted optical power of the obtained ONU or ONT is the lower limit of the transmitted optical power, and if yes, ends the adjustment; if not, then proceeds to step 313; if the uplink data has no error, if the current transmission is performed If the optical power is already the lower limit of the transmitted optical power of the ONU or ONT, there is no room for adjustment and the adjustment ends; otherwise, continue to execute downward. Step 313: The OLT notifies the ONU or the ONT that the transmission optical power is lowered by one level;

The OLT can notify the ONU or the ONT to lower the transmission optical power by one level by adjusting the OAM PDU frame as shown in FIG. 6. Step 315: The OLT changes the adjustment mode state parameter to the downward adjustment, and returns to step 303. Step 317: The OLT determines whether the current transmitted optical power of the obtained ONU or the ONT is the upper limit of the transmitted optical power, and if yes, ends the adjustment; Step 319: If there is an error in the uplink data, if the current transmitted optical power is already the upper limit of the transmitted optical power of the ONU or the ONT, the adjustment is not required to be performed, and the adjustment is terminated; otherwise, the downward execution is continued. Step 319: The OLT determines whether the adjustment mode status parameter is recovery. If yes, go to step 321; if no, go to step 323; Step 321: The OLT notifies the ONU or the ONT to set the transmission optical power to the upper limit of the transmitted optical power, and return to the step. 4 。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。 It should be noted that the ONU or the ONT saves the adjusted transmit optical power to its own storage medium after each adjustment of the transmitted optical power. After the power is turned off and then turned on, the saved transmission is queried from the storage medium. The optical power value, if queried, sets the current transmit optical power to the saved transmit optical power value, otherwise sets the current transmit optical power to the transmit optical power upper limit.

After the ONU or ONT is powered on, the current transmitted optical power is set to the saved last transmitted optical power, because the transmitted optical power required for this uplink data transmission may be different from the previous one, so the saved adjusted transmitted light is saved. The power can meet the requirements of the uplink data transmission, thereby reducing the optical power adjustment probability, or shortening the adjustment process, saving system resources and improving system efficiency. If the transmitted optical power of the saved ONU or ONT is not obtained after the ONU or the ONT is powered on, set the upper limit of the transmitted optical power of the current transmitted optical power to ONU or ONT. Referring to FIG. 4, a flow chart of the steps of the third embodiment of the optical power adjustment method of the EPON system of the present invention is shown. The present embodiment is based on the second embodiment shown in FIG. 3, and the main difference is that before the step 4 is 301, The division of the transmission optical power level of the ONU or the ONT, and the registration process of the ONU or the ONT to the OLT are the same as those in the second embodiment. Specifically, the embodiment may include the following steps: Step 401: Divide the transmit optical power of the ONU or the ONT into N levels;

A suitable method, in this embodiment, divides the transmitted optical power into N levels according to the range of the transmitted optical power of the ONU or the ONT, where N is a natural number. It is assumed that the N-1th level is the minimum transmission optical power, the 0th stage is the maximum transmission optical power, and the corresponding optical power difference between the adjacent two stages is equal. In this embodiment, the difference is 2db. Step 403: Set the default transmit optical power of the ONU or the ONT to be the maximum transmit optical power. Set the default transmit optical power of the ONU or the ONT to the maximum transmit optical power, so that the ONU or the ONT can transmit data by using the default transmit optical power. It can guarantee the quality of the transmission and also guarantee the transmission speed. Of course, other suitable settings may be employed by those skilled in the art, and the present invention is not limited thereto. Step 405: When the ONU or the ONT is not registered, the ONU or the ONT sends a registration request frame to the OLT. Step 407: The ONU or the ONT determines whether the registration frame sent by the OLT is received within the set time, and if not, then Step 409; If yes, transfer to step 301; if the registration frame is not received, it indicates that the registration of the ONU or the ONT to the OLT is unsuccessful, and step 409 is performed. If the registration frame is received, it indicates that the registration of the ONU or the ONT to the OLT is successful, and the step 301 in the second embodiment shown in FIG. 3 is continued, and the steps in the second embodiment are continued to be performed downward to adjust the transmit optical power. Step 409: Set the transmit optical power of the ONU or the ONT to the default transmit optical power. In this embodiment, the transmit optical power of the ONU or the ONT is set to the 0th level to ensure that the ONU or the ONT is successfully registered at a relatively fast speed. Certainly, if the default transmit optical power is not the 0th level, the default transmit optical power may not be used, and the transmit optical power is directly set to the maximum transmit optical power, that is, the 0th transmit optical power. Referring to FIG. 5, a flow chart of a method for acquiring an OLT to transmit current optical power of an ONU or an ONT according to an embodiment of the present invention may specifically include the following steps: Step 501: The OLT sends an optical power query message frame to an ONU or an ONT. ;

The OLT may send multiple optical power query message frames to the ONU or the ONT to avoid packet loss in the data transmission, and ensure that the ONU or the ONT receives the optical power query message frame. The optical power query message frame in this embodiment uses the structure shown in FIG. 7 to extend the OAM PDU frame format of the 57.4.2 section of the IEEE 802.3ah protocol to form an optical power query OAM PDU frame. The packet length is 64 bytes and the Code field takes the value 06. Step 503: The OLT determines whether the optical power inquiry response message frame fed back by the ONU or the ONT is received within the set time, if yes, go to step 505; if no, go to step 507;

The OLT determines whether the response frame of the ONU or ONT response optical power inquiry message frame is received within the set time, and obtains the transmission optical power of the ONU or the ONT according to the judgment result. Step 505: The OLT acquires the transmitted optical power of the ONU or the ONT from the optical power query response message frame.

After receiving the optical power query message frame of the OLT, the ONU or the ONT fills the current transmit optical power into the optical power query response message frame and sends it to the OLT. The optical power query response message frame in this embodiment uses the structure shown in FIG. 8 to extend the OAM PDU frame format of the 57.4.2 section of the IEEE 802.3ah protocol to form an optical power query response OAM PDU frame. The packet length is 64 bytes, the Code field takes the value 07, and the first byte of the Data field represents the optical power level. Step 507: The OLT considers that the transmitted optical power of the ONU or the ONT is the upper limit of the transmitted optical power.

When the OLT does not receive the optical power inquiry response message frame, the OLT directly sets the transmission optical power of the ONU or the ONT to the upper limit of the transmission optical power, which satisfies the transmission optical power requirement on the one hand, and avoids repeatedly initiating the query on the other hand. The resulting resources are wasted and the system is inefficient. Referring to FIG. 9, a block diagram of a structure of an OLT according to the present invention is shown, which may include: a startup module 901, configured to start an optical power adjustment process after the ONU or ONT is successfully registered. The detecting module 902 is configured to detect whether there is an error in the uplink data from the ONU or the ONT during the optical power adjustment process, and detect whether the uplink data has an error in the step of step-by-step down-stepping and step-by-step up-scaling. The down regulation module 903 is configured to notify the ONU or the ONT to lower the transmission optical power step by step if there is no error in the uplink data. The up-modulation module 904 is configured to notify the ONU or the ONT to up-regulate the transmit optical power step by step if the detection module detects that the uplink data has an error code during the step-by-step down-modulation process. The stopping module 905 is configured to stop the adjustment if the detecting module detects that the uplink data is not erroneous during the step-up process. Preferably, the adjustment mode state parameter is set in the OLT, including: recovery, up, and down. Further, the OLT may further include: an initialization module, configured to initialize the adjustment mode state parameter to recovery before the optical power adjustment process is started after the ONU or the ONT is successfully registered. The optical power acquisition module is configured to acquire the current transmit optical power of the ONU or the ONT before the detection module detects whether the uplink data from the ONU or the ONT is erroneous. The upper limit sending module is configured to: when the ONU or the ONT is not registered, and send a registration request to the OLT, if the OLT does not receive the response to the registration request within the set time, set the transmit optical power of the ONU or the ONT to be sent. The upper limit of optical power. Preferably, the down regulation module 903 of the OLT may include: a first down regulation module, configured to: when there is no error in the uplink data, the adjustment mode state parameter is not up, and the current transmit optical power of the ONU or the ONT is not the transmission light of the ONU or the ONT. When the power lower limit is reached, the ONU or the ONT is notified to lower the first-level transmission optical power, and the adjustment mode state parameter is set to be lowered. The second down-modulation module is configured to stop the adjustment when the uplink data is not error-coded, the adjustment mode state parameter is not up-regulated, and the current transmit optical power of the ONU or the ONT is the lower limit of the transmit optical power of the ONU or the ONT. Preferably, the up-modulation module 904 may include: a first uplinking module, configured to: when the uplink data is erroneous, the current transmit optical power of the ONU or the ONT is not the upper limit of the transmit optical power of the ONU or the ONT, and When the adjustment mode status parameter is not restored, the ONU or the ONT is notified to increase the transmission optical power of the first level, and the adjustment mode status parameter is set to be up. The second upward adjustment module is configured to stop the adjustment when the current transmission optical power of the ONU or the ONT is the upper limit of the transmission optical power of the ONU or the ONT. a third upward adjustment module, configured to: when the uplink data is erroneous, the current transmit optical power of the ONU or the ONT is not the upper limit of the transmit optical power of the ONU or the ONT, and the adjustment mode state parameter is recovery, The ONU or ONT is adjusted to the upper limit of the transmitted optical power. Preferably, the stopping module 905 may include: a first stopping module, configured to stop the adjusting when the uplink data has no error, and the adjustment mode state parameter is an upward adjustment.

The adjustment mode state parameter including recovery, up-regulation, and down-regulation is set in the OLT. After the initialization module succeeds in registering ONU or ,, the initialization adjustment mode state parameter is restored, and the startup module 901 starts the optical power adjustment process. The detecting module 902 detects whether there is an error in the uplink data from the ONU or the UI during the optical power adjustment process. If there is no error, the down-module module 903 notifies the ONU or the 下 to lower the transmitted optical power step by step. In this process, the detecting module 902 continues to detect whether the uplink data of the ONU or the 有 is erroneous, and if the uplink data is not adjusted during the step-by-step process, If the error occurs again, the stop module 905 stops transmitting the optical power adjustment. Otherwise, the up-modulation module 904 up-regulates the transmitted optical power until the error-free or transmitted optical power reaches the upper limit of the transmitted optical power. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any particular combination of hardware and software. The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

1. An Ethernet passive optical network optical power adjustment method for an EPON system, comprising the steps of:

After the optical network unit ONU or the optical network terminal ONT registers successfully, the optical power adjustment process is started.

In the optical power adjustment process, the OLT detects whether the uplink data from the ONU or the ONT is erroneous;

If there is no error, the ONU or the ONT is notified to lower the transmit optical power step by step, and the OLT continues to detect whether the uplink data has an error code during the step-by-step down-regulation process;

If the OLT detects that the uplink data is erroneous, the OLT is notified to the ONU or the ONT to increase the transmit optical power step by step, and the OLT continues to detect the uplink data during the step-by-step up-regulation process. With or without errors; and

If the OLT detects that the uplink data has no bit error during the step-up process, the OLT stops adjusting.

The method according to claim 1, wherein the OLT is provided with an adjustment mode state parameter, including: recovery, up, and down.

The method according to claim 2, wherein after the OLT is successfully registered in the ONU or the ONT, before the optical power adjustment process is started, the method further includes:

The adjustment mode state parameter is initialized to recovery.

The method according to claim 2, wherein before the OLT detects whether the uplink data from the ONU or the ONT is erroneous, the method further includes the step of acquiring the current transmit optical power of the ONU or the ONT, specifically For:

Sending, by the OLT, an optical power query frame to the ONU or the ONT;

Receiving an optical power query response frame returned from the ONU or ONT; and acquiring a current transmit optical power of the ONU or the ONT from the optical power query response frame. The method of claim 4 further comprising the steps of: The optical power query response frame returned from the ONU or ONT is not received within the set time;

The current transmit optical power of the ONU or the ONT is determined to be an upper limit of the transmit optical power.

The method according to claim 4, further comprising the following steps before the obtaining the current transmitted optical power of the ONU or the ONT:

The OLT detects that the ONU or ONT is offline, and the OLT stops adjusting.

7. The method of claim 1, further comprising the steps of:

If the ONU or the ONT is not registered and sends a registration request to the OLT, determining whether the response of the OLT to the registration request is received within a set time;

If not, set the transmit optical power of the ONU or ONT to the upper limit of the transmit optical power.

The method according to claim 4, wherein if there is no error, the step of informing the ONU or the ONT to lower the transmitted optical power step by step includes:

The OLT determines that the uplink data has no error, and determines that the adjustment mode state parameter is not up-regulated, and the current transmit optical power of the ONU or the ONT is not the lower limit of the transmit optical power of the ONU or the ONT; The OLT notifies the ONU or the ONT to lower the primary transmission optical power, and sets the adjustment mode state parameter to be lowered;

The OLT determines that the uplink data has no error, and determines that the adjustment mode state parameter is not up-regulated, and the current transmit optical power of the ONU or the ONT is a lower limit of the transmit optical power of the ONU or the ONT;

The OLT stops adjusting.

The method according to claim 4, wherein, if the OLT detects that the uplink data has an error, the OLT is notified that the ONU or the ONT up-regulates the sending light step by step. The step 4 of power includes:

The OLT detects that the uplink data is erroneous, and determines that the current transmit optical power of the ONU or the ONT is not the upper limit of the transmit optical power of the ONU or the ONT, and the adjustment mode state parameter is not restored;

The OLT notifies the ONU or the ONT to adjust the first-level transmission optical power, and set the adjustment mode state parameter to be up-regulated; The OLT detects that the uplink data has an error, and determines that the current transmit optical power of the ONU or the ONT is an upper limit of the transmit optical power of the ONU or the ONT;

The OLT stops adjusting;

The OLT detects that the uplink data is erroneous, and determines that the current transmit optical power of the ONU or the ONT is not the upper limit of the transmit optical power of the ONU or the ONT, and the adjustment mode state parameter is recovery;

The OLT notifies the ONU or ONT to adjust to the upper limit of the transmitted optical power.

The method according to claim 4, wherein, if the OLT detects that the uplink data has no error in the process of step-up, the step of the OLT stopping to adjust includes: the OLT detecting There is no error code to the uplink data, and it is determined that the adjustment mode state parameter is an upward adjustment;

The OLT stops adjusting.

11. The method of claim 1 further comprising the steps of:

Saving the transmitted optical power of the ONU or ONT after adjustment;

After the ONU or the ONT is powered on, the current transmit optical power of the ONU or the ONT is set to the stored transmit optical power.

12. The method of claim 11 further characterized by the following steps:

If the ONU or the ONT does not obtain the transmitted optical power after the ONU or the ONT is powered on, the current transmit optical power of the ONU or the ONT is set to be the upper limit of the transmit optical power.

13. An optical line terminal OLT, comprising:

The startup module is configured to start an optical power adjustment process after the optical network unit ONU or the optical network terminal ONT is successfully registered;

a detecting module, configured to detect, in the optical power adjustment process, whether the uplink data from the ONU or the ONT is erroneous; and detecting whether the uplink data has an error code during a step-by-step downward adjustment and a step-by-step upward adjustment process;

And the lowering module is configured to notify the ONU or the ONT to gradually reduce the transmit optical power if the uplink data has no error code; The up-modulation module is configured to notify the ONU or the 上 to up-regulate the transmit optical power step by step if the detection module detects that the uplink data is erroneous in the step-by-step down-modulation process; In the step of step-up, the detecting module detects that the uplink data has no error, and stops the adjustment.

The OLT according to claim 13, wherein the OLT is provided with an adjustment mode state parameter, including: recovery, up, and down.

The OLT according to claim 14, further comprising:

The optical power acquisition module is configured to acquire the current transmit optical power of the ONU or the UI before the detection module detects whether there is an error in the uplink data from the ONU or the UI.

The OLT according to claim 15, wherein the down regulation module comprises:

a first down-modulation module, configured to: when the uplink data has no error, the adjustment mode state parameter is not up, and the current transmit optical power of the ONU or ΟΝΤ is not the lower limit of the transmit optical power of the ONU or ΟΝΤ Notifying the ONU or the ΟΝΤ to lower the first-level transmission optical power, and setting the adjustment mode state parameter to be lowered;

a second down-modulation module, configured to: when the uplink data has no error, the adjustment mode state parameter is not up-regulated, and the current transmit optical power of the ONU or UI is the lower limit of the transmit optical power of the ONU or the UI, Stop adjusting.

The OLT according to claim 15, wherein the up-modulation module comprises:

The first uplink module is configured to: when the uplink data has an error, the current transmit optical power of the ONU or the UI is not the upper limit of the transmit optical power of the ONU or the UI, and the adjustment mode state parameter is not restored. Notifying the ONU or the ΟΝΤ to adjust the first-level transmitting optical power, and setting the adjustment mode state parameter to be an upward adjustment;

The second upward adjustment module is configured to stop the adjustment when the current transmission optical power of the ONU or ΟΝΤ is the upper limit of the transmission optical power of the ONU or ΟΝΤ, and the third upward adjustment module is configured to be used when The uplink data has an error, and the current transmission optical power of the ONU or the UI is not the upper limit of the transmission optical power of the ONU or the UI, and when the adjustment mode state parameter is recovery, the ONU or the UI is notified to adjust to the location. The upper limit of the transmitted optical power. The OLT according to claim 14, further comprising: And an upper limit sending module, configured to: when the ONU or the ONT is not registered, send a registration request to the OLT, if the OLT does not receive the response to the registration request within a set time, set the ONU Or the transmitted optical power of the ONT is the upper limit of the transmitted optical power.